/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.api.service.impl;

import org.apache.dolphinscheduler.api.enums.Status;
import org.apache.dolphinscheduler.api.service.MonitorService;
import org.apache.dolphinscheduler.common.constants.Constants;
import org.apache.dolphinscheduler.common.enums.NodeType;
import org.apache.dolphinscheduler.common.model.Server;
import org.apache.dolphinscheduler.common.model.WorkerServerModel;
import org.apache.dolphinscheduler.dao.MonitorDBDao;
import org.apache.dolphinscheduler.dao.entity.MonitorRecord;
import org.apache.dolphinscheduler.dao.entity.User;
import org.apache.dolphinscheduler.service.registry.RegistryClient;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.google.common.collect.Sets;

/**
 * monitor service impl
 */
@Service
public class MonitorServiceImpl extends BaseServiceImpl implements MonitorService {

  public static final Logger logger = LoggerFactory.getLogger(MonitorServiceImpl.class);

  @Autowired
  private MonitorDBDao monitorDBDao;

  @Autowired
  private RegistryClient registryClient;

  /**
   * query database state
   *
   * @param loginUser login user
   * @return data base state
   */
  @Override
  public Map<String, Object> queryDatabaseState(User loginUser) {
    Map<String, Object> result = new HashMap<>();
    List<MonitorRecord> monitorRecordList = monitorDBDao.queryDatabaseState();
    result.put(Constants.DATA_LIST, monitorRecordList);
    putMsg(result, Status.SUCCESS);
    return result;
  }

  /**
   * query master list
   *
   * @param loginUser login user
   * @return master information list
   */
  @Override
  public Map<String, Object> queryMaster(User loginUser) {
    Map<String, Object> result = new HashMap<>();
    List<Server> masterServers = getServerListFromRegistry(true);
    result.put(Constants.DATA_LIST, masterServers);
    putMsg(result, Status.SUCCESS);

    return result;
  }

  /**
   * query worker list
   *
   * @param loginUser login user
   * @return worker information list
   */
  @Override
  public Map<String, Object> queryWorker(User loginUser) {

    Map<String, Object> result = new HashMap<>();
    List<WorkerServerModel> workerServers = getServerListFromRegistry(false)
        .stream()
        .map((Server server) -> {
          WorkerServerModel model = new WorkerServerModel();
          model.setId(server.getId());
          model.setHost(server.getHost());
          model.setPort(server.getPort());
          model.setZkDirectories(Sets.newHashSet(server.getZkDirectory()));
          model.setResInfo(server.getResInfo());
          model.setCreateTime(server.getCreateTime());
          model.setLastHeartbeatTime(server.getLastHeartbeatTime());
          return model;
        })
        .collect(Collectors.toList());

    Map<String, WorkerServerModel> workerHostPortServerMapping = workerServers
        .stream()
        .collect(Collectors.toMap(
            (WorkerServerModel worker) -> {
              String[] s = worker.getZkDirectories().iterator().next().split("/");
              return s[s.length - 1];
            }
            , Function.identity()
            , (WorkerServerModel oldOne, WorkerServerModel newOne) -> {
              oldOne.getZkDirectories().addAll(newOne.getZkDirectories());
              return oldOne;
            }));

    result.put(Constants.DATA_LIST, workerHostPortServerMapping.values());
    putMsg(result, Status.SUCCESS);

    return result;
  }

  @Override
  public List<Server> getServerListFromRegistry(boolean isMaster) {
    return isMaster
        ? registryClient.getServerList(NodeType.MASTER)
        : registryClient.getServerList(NodeType.WORKER);
  }

}
